Packing for pistons and the like



p 1931- s. M. GREENIDGEI I 1,825,185

Filed Dec. 11, 1926 Patented Sept. 29, 1931 summ. u. GBEENIDGE, or rnuaanm 'rn'xas f racxnm roa rrsrons AND rim LIKE Application filed December 11, 1926. Serial No. 154,586.

This invention relates to packings for pump pistons as well as for engine pistons and stufiing boxes, and has for its object to provide an improved and'moredurable type of packing.

' Another object of a novel means regular contact may be maintained between the packing and the surface with which it I v elements; namely, the inner and outer cup cooperates.

I Other objects and advantages of the vention will be apparent to those skilled in the art to which the present invention relates as the description proceeds.

In the drawings: Figure 1 is a vertical section through an apparatus in which the present invention is incorporated.

Figure 2 is a fragmentary plan v1ew of one portion of the packing before being bent into shape.

Figure 3. is a fragmentary plan view. of another portion of the packing beforebeing bent into shape, and;

other part of a mechanism requiring packing. In the particular embodiment ofthe invention illustrated a hollow piston rod 2 is employed in conjunction with the cylinder 1 and is formed at its lower end with a reduced portion providing a shoulder 3 against which the packing 4 is seated. This packing which will be described in detail hereinafter, is of cup-shaped formation and 1s held against the shoulder 3 by means of a washer 5 and the lock nuts 6 and 7 threaded onto the lower end of the rod 2.

Slid'ably mounted on the piston rod 2 above the packing 4 is an annular member 8 provided with a wedge-shaped lower edge 9 adapted for cooperation with the,flare upper endof the packing 4. A coil spring 10 engages the upper edge pf the member 8 and is held under lock nuts 11 and 12 threaded to the piston rod 2. By this construction it will be ap- V y pressure against the inner wall of the of the invention consists by which a constant and tending fingers 18'-19.

Figure 4 is a fragmentary end view of a compresslonby means of the parent that the beveled or wedge-shaped edge of the member 8 will always be forced against the flared upper edge of the packing 4 and force it with a regular and constant cylinder 1.

I will now' describe the several elements comprising the packing 4. This packing preferably comprises three formations which are formed of metal and the intermediate portion formed of flexible -material such as fiber, rubber, leather, as-

bestos or the like; although metal maybe used for this intermediate layer if desired.

The inner and outer cup'shaped elements are designated by the numerals 13 and 14 respectively and are each formed from centrally apertured discs providedwith a plain innerportion 1617 and with radially ex- Each of" these fingers is provided with a ridge on its opposite surfaces so as to provide a substantially diamond shape in cross-section as clearly shown in Figure 4. Obviously as these fingers are bent up into final position they will overlap and provide continuous side walls as shown in Fig. 4.

In assembling the packing 4 the longer cup-shaped element is nested within the shorter one but is spaced therefrom so as to provide for the introduction. of the flexible packing material 15. Should this intermediate packing be formed of metal however, it' is contemplated that the same be formed ,in the identical manner as the elements 13 and 14.. From an inspection of Figure 1 it will be seen that the side walls of the cup-shaped elements 13 and 14 are flared outwardly'and that the intermediate'packing section 15 has its upper edgebeveled off so as to merge into the upper edges of the inner and outer elements 13 and 14. The plain annular portions 16 and 17 ofthe cup-shaped elements as well as the inturned portion of the packing 15 are clamped between the shoulder 3 on the pistonrod and the washer 5 as hereinbefore described. 7 I

While the present embodiment of the invention has been described as constructed of metallic cup-shaped elements and an intermediate cup-shaped portion of resilient material such as fiber, rubber, asbestos or leather, it is tobe understood that the invention is not to be limited to these materials or combination of materials, since the packing may be constructed of any one or more of these materials depending upon the service which the piston or the like is designed to render. In this connection it may be stated that the arrangement of the packing might readily be changed so as to be employed in a stufiing box or the like if desired. A

From the foregoing description taken in connection with the accom anying drawings it will be apparent that- I have devised a packing construction which provides for a constant and regular contact between the packing and related parts; that such contact is maintained irrespective of wear on the packing or other parts due to the chemical action of acids or the abrasive action of sand or the like which may be present in water or other fluid passing through the apparatus; and that accordingly the life of the pump or other apparatus in which the packing is installed is materially lengthened.

In accordance with the patent statutes I have described what I now believe to be the best embodiment of the invention, but I do not wish to be understood thereby as limiting myself or the scope of the invention, as 7 many changes and modifications may be made without departing from the spirit of the invention; all such I aim to include in the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. A packing including a plurality of substantially cup-shaped-elernents arranged in n'estedrelationship, -certain of said elements being formed from slitted discs, the portions of the discs between the slits being bent up and providing overlapping fingers on each disc.

2. A packing-including a pair of substantially cup-shaped elements of diflerent heights arranged in nested relationship but spaced apart, said element of greater height being within the other element, flexible packing material filling the space between said elements and having its upper end beveled so as to merge into the upper edges of the two cup-shaped elements.

3. A packing including a pair of substantially cup-shaped elements arranged in nested relationship but spaced apart, the side walls of said elements being slitted to provide a plurality of overlapping fingers on each element, and flexible packing material filling the space between said nested elements.

4. A packing element comprising an annu- SAMUEL M. GREENIDGE. 

